A176074 Partial sums of A006343.

1, 1, 2, 3, 7, 17, 51, 163, 561, 2004, 7391, 27873, 107050, 417152, 1645339, 6555752, 26348334, 106691779, 434851380, 1782551286, 7344326285, 30397197514, 126324028956, 526911437207, 2205163133586, 9256931835831, 38967696710845

Offset: 0

Author

Jonathan Vos Post, Apr 07 2010

Keywords

• easy
• nonn

Comments

Partial sums of Arkons: number of elementary maps with n-1 nodes. The subsequence of primes in the partial sum begins: 2, 3, 7, 17, 163, no more through a(26).

Examples

			a(7) = 1 + 0 + 1 + 1 + 4 + 10 + 34 + 112 = 163 is prime.
		

Crossrefs

Cf. A006343, A000934.

Formula

a(n) = SUM[i=0..n] A006343(i) = SUM[i=0..n].